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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44a3823cec1cec631d0c0a303d0e7af609a785ed833b197f6b37706f5a21782' 
  AND token = 'FK2CE8wAkA+rPQbE+GGBOWF27dtYHBqIj9Ps2IfAVE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}